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Cw 220 fix grey exchange screen (#641)

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* Fix nullability issue for ChangeNow rateId

* Handle concurrent modification error from Splay Tree
This commit is contained in:
Omar Hatem 2022-11-22 03:52:03 +02:00 committed by GitHub
parent 3d836d5dce
commit bcf09b048c
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1 changed files with 83 additions and 75 deletions
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10
lib/view_model/exchange/exchange_view_model.dart
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@ -7,7 +7,6 @@ import 'package:cake_wallet/exchange/sideshift/sideshift_exchange_provider.dart'
import 'package:cake_wallet/exchange/sideshift/sideshift_request.dart';
import 'package:cake_wallet/exchange/simpleswap/simpleswap_exchange_provider.dart';
import 'package:cake_wallet/view_model/settings/settings_view_model.dart';
import 'package:cw_core/transaction_priority.dart';
import 'package:cake_wallet/exchange/simpleswap/simpleswap_request.dart';
import 'package:cw_core/wallet_base.dart';
import 'package:cw_core/crypto_currency.dart';
@ -375,6 +374,7 @@ abstract class ExchangeViewModelBase with Store {
TradeRequest? request;
String amount = '';
try {
for (var provider in _sortedAvailableProviders.values) {
if (!(await provider.checkIsAvailable())) {
continue;
@ -465,6 +465,14 @@ abstract class ExchangeViewModelBase with Store {
tradeState = TradeIsCreatedFailure(
title: S.current.trade_not_created,
error: S.current.none_of_selected_providers_can_exchange);
} on ConcurrentModificationError {
/// if create trade happened at the exact same time of the scheduled rate update
/// then delay the create trade a bit and try again
///
/// this is because the limitation of the SplayTreeMap that
/// you can't modify it while iterating through it
Future.delayed(Duration(milliseconds: 500), createTrade);
}
}
@action